--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scripts/image-comment.sh	Fri Dec 07 16:27:00 2018 +0100
@@ -0,0 +1,8 @@
+#!/bin/bash
+
+FILE="$1";
+COMMENT="$2";
+COPYRIGHT="Relational pipes (c) $(date +%Y) Frantisek Kucera, Frantovo.cz, GlobalCode.info; copylefted under the GNU FDLv1.3+ license"; # this tag should be in ASCII, see http://www.exiv2.org/tags.html
+
+[ -n "$FILE"    ] && exiv2 -M "set Exif.Image.Copyright $COPYRIGHT" "$FILE";
+[ -n "$COMMENT" ] && exiv2 -M "set Exif.Photo.UserComment charset=Unicode $COMMENT" "$FILE";